High-resolution direct-writing of metallic electrodes on flexible substrates for high performance organic field effect transistors |
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Authors: | Sadir G. Bucella Giorgio Nava Krishna Chaitanya Vishunubhatla Mario Caironi |
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Affiliation: | 1. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milano, Italy;2. Politecnico di Milano, Dipartimento di Fisica, P.za L. da Vinci 32, 20133 Milano, Italy |
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Abstract: | We report on organic field-effect transistors (OFETs) with sub-micrometer channels fabricated on plastic substrates with fully direct-written electrical contacts. In order to pattern source and drain electrodes with high resolution and reliability, we adopted a combination of two digital, direct writing techniques: ink-jet printing and femtosecond laser ablation. First silver lines are deposited by inkjet printing and sintered at low temperature and then sub-micrometer channels are produced by highly selective femtosecond laser ablation, strongly improving the lateral patterning resolution achievable with inkjet printing only. These direct-written electrodes are adopted in top gate OFETs, based on high-mobility holes and electrons transporting semiconductors, with field-effect mobilities up to 0.2 cm2/V s. Arrays of tens of devices have been fabricated with high process yield and good uniformity, demonstrating the robustness of the proposed direct-writing approach for the patterning of downscaled electrodes for high performance OFETs, compatibly with cost-effective manufacturing of large-area circuits. |
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Keywords: | Organic field-effect transistor Femtosecond laser ablation Inkjet printing Direct writing |
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